Core rock-drill



Unrrnn STATES LEWIS D. CONNER, OF OBERLIN, AND CHARLES F. PEEBLES, OFBEREA, OHIO.

CORE ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 312,093, dated February10, 1885.

(X0 model.)

To aZZ whom it may concern.-

terial of small sizearc from time to time placed Be it known that we,Lnwrs D. CONNER and l in the hole, and the rock is cut away by theCHARLES F. PEEBLES, respectively of Oberlin, in the county of Lorain andState of Ohio,

and of Berea, in the county of Ouyahoga and State of Ohio, have inventedcertain new and useful Improvements in Core RoclcDrills; and we dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit pertains to make and use the same.

Our invention relates to improvements in core rock-drills and to aprocess for operating the same, the object being to provide a corerock-drill at a less initial cost than devices of this kind heretoforein use.

Our invention also relates to a process of drilling rockby frictioncaused by rotating the drill with sand, chilled-iron globules, or otherhard material of small size intermediate between the core-drill and therock, in combination with water or other fluid to soften the rock andabsorb the cuttings from the rock.

With these objects in view our invention consists in certain features ofconstruction, and in combination of parts, and in a process, that arehereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure l is an elevation in section of ourimproved coredrill in position in the rock. Fig. 2 is an elevation,partly in section, of the same.

The drill proper consists of a metal tube, A, preferably of the ordinarywrought-iron tubing, and of such size as may be required, according tothe size of the hole to be drilled in the rock. The part A is usuallysome five or six feet, more or less, in length, and has a head, a,formed, preferably, by closing or swaging the end of the tube; but ifthe tube A is quite large, a separate piece may be had inside of thetube to form the part a. Asmaller tube, B, usually about one and a halfor two inches in diameter inside, is secured to the head a, and formsthe shank or spindle by which the drill is rotated. The mechanism forrotating and elevating the drill is of the ordinary construction, and isso well known that it is not considered necessary to describe it. Smallchilled-iron globules, sand, or other hard mafriction of such materialcaused by the rotation of the drill. The action is similar to that hadin the well-known process of sawing stone. The chilled-iron globules arepreferable, for the reason that they cut the stone very fast, a 1d arecomparatively inexpensive, in View of the fact that there is no waste ofmaterial, as the globules are confined in the bottom of the hole, asshown at I. The tube B is extended from time to time by attachingadditional lengths of tubing in the usual manner.- This tube usuallyextends some ten or fifteen feet, more or less, above the ground, and astream of water is constantly kept flowing into it, which, passing downunder the drill, absorbs the cuttings from the rock, that of course arefine dust. By this means the drill is released from the cuttings thatare carried up with the water and overflow at the top of the ground. Oneor more slots, 1, should be made in the end of the drill in order thatthe water may have free passage from the inside to the outside of thedrill. Wooden guide-blocks D are from time to time placed upon the tubeB, and are held down by a collar and set-screw, d. As the hole is alwaysfull of water, the blocks D are buoyed up thereby, so that no collar isrequired under the guide-blocks. These blocks should fit easily on thetube and form journalboxes for the same, but should not fit the hole inthe rock so closely as to prevent the free passage of water. We prefersquare blocks for these guides of such size that strips of rubber 6 maybe nailed to the corners of the blocks to make these corners fit theholes in the rock. Such blocks leave afree passageway for the water, andare easily forcedalong the bore in the rock to the position required.

One of these guide-blocks should be near the upper end of the drill, andothers should be attached around the tube, say twelve to fifteen feet,more or less, apart, according to the circumstances, of which theoperator will be the best judge. A small tube or rod, 0, extends throughthe tube B, and has a long, narrow, thin, elastic blade-bent or curvedlongi: tudinally, so that it has to be sprung back or partiallystraightened when it is placed in the tube B. Of course, this tube islengthened from time to time by additional lengths. Af-

ter the drill has cut into the rock for some distance a core, D, isleftinside the drill, and must be removed. The rod 0 is thrust down, andas the end of the blade 0 passes into the tube Athe recoil of the bladecarries the point thereof to one side and enters between the side of thetube A and the core D. There are usually more or less seams in the rock,so that the core is readily broken, when the blade 0 is wedged in on oneside of the core, and at the same time the portion of the core that isbroken off is held sufliciently firm in the tube A by means of the wedgeto be lifted out with the drill. In commencing the work, if the rockextends to the surface, a shallow annular groove is usually first cut inthe .rock to form a seat for the drill and to hold the said globules,sand, or other material used. This drill and process are well adapted tochanneling rock in quarryingstone, and for this purpose the drills maybe used in gangs of any desired number, and the cores, if of large size,are available for columns, and the smaller sizes are useful forornaments and various purposes.

The small initial cost of the drill and the cheapness of the processrender the device available to farmers or others who cannot afuse.

\Vhat we claim is- 1. A core-drill consisting, essentially, of a metaltube or drill proper, secured to a smaller tube, which serves as awater-supply pipe and a spindle, and adjustable guide-blocks secured tosaid spindle, substantially as set forth.

2. The combination, with the tube A, provided with the head a and one ormore slots 0r openings, 1, and secured to the tube B, of the rod or tube0, provided with the elastic blade 0, bent and operated in the mannershown, substantially as set forth.

3. The combination, with a coredrill and a hollow spindle secured to oneend of the core-drill, of the wooden guide-blocks and the collarsadjustably secured to the spindle, substantially as set forth.

In testimony whereof we sign this specification, in the presence of twowitnesses, this 18th day of August, 1884.

LEWIS D. OONNER. CHARLES F. PEEBLES.

\Vituesses:

D. C. WISNER, EDWD. ROBINSON.

